.Header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 2;
}
.Nav {
    position: fixed;
    top: 80px;
    left: 0;
    bottom: 20px;
    background: #F5F5F5;
    overflow-x: hidden;
    z-index: 2;
}
.Content {
    position: absolute;
    top: 90px;
    left: 210px;
    min-height: 400px;
    min-width: 1000px;
    border: 1px #ccc solid;
    padding: 20px 15px;
    margin-bottom: 30px;
}
.Footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
}